Spherical annular seal
AssigneeOiles Corporation
InventorsTakashi Maeda, Shuichi Kubota, Takeshi Furukido, Toshiyuki Nishio
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Abstract
A spherical annular seal having a through hole in a center thereof and a partially convex spherical surface portion on an outer surface thereof, wherein a surface of the partially convex spherical surface portion is formed into a smooth surface in which a lubricating sliding layer of a lubricating composition containing 70 to 90 wt. % of boron nitride and 10 to 30 wt. % of alumina and/or silica and a reinforcing material constituted by a metal wire net covering the lubricating sliding layer and integrated with the lubricating sliding layer are integrated in mixed form.
Claims5
A spherical annular seal for use with an exhaust pipe joint, comprising:
- an annular base portion including a compressed reinforcing material and a compressed heat-resistant material, said reinforcing material being made of a fine metal wire net, said heat-resistant member being made of material selected from the group consisting of expanded graphite, mica and asbestos;
- and
- an annular outer portion provided unitarily on said base portion and having a partially convex spherical outer surface which is formed smoothly, said outer portion having a lubricating sliding layer, an exposed outer surface of said layer being made of a lubricating composition which is a mixture of 70 to 90 wt. % of boron nitride and 10 to 30 wt. % of material selected from the group consisting of alumina, silica, and mixtures thereof;
- said outer surface of said lubricating sliding layer being covered partially with a reinforcing material made of a compressed fine metal wire net which is embedded mixedly unitarily in said sliding layer, said exposed outer surface of the lubricating sliding layer defining said partially convex spherical outer surface.
Dependencies are inferred from the claim text.